| Atomic Number: | 69 |
| Element Symbol: | Tm |
| Element Name: | Thulium |
| Atomic Weight: | 168.93421 |
| Group Name: | Lanthanoid |
| Period Number: | 6 (lanthanoid) |
| Block: | f-block |
| Ground State Configuration: | [Xe] 4f13 6s2 |
| Ground State Level: | 2Fo7/2 |
| Standard State: | Solid |
| Bond Length: | 344.7 |
| Atomic Radius Empirical: | 175 |
| Atomic Radius Calculated: | 222 |
| Electron Affinity: | 50 |
| First Ionization Energy: | 596.7 |
| Pauling Electronegativity: | 1.25 |
| Allred Rochow Electronegativity: | 1.11 |
| Density Of Solid: | 9321 |
| Molar Volume: | 19.1 |
| Youngs Modulus: | 74 |
| Rigidity Modulus: | 31 |
| Bulk Modulus: | 45 |
| Poissons Ratio: | 0.21 |
| Brinell Hardness: | 471 |
| Vickers Hardness: | 520 |
| Electrical Resistivity: | 70 |
| Melting Point: | 1545 |
| Boiling Point: | 1950 |
| Thermal Conductivity: | 17 |
| Coefficient Of Linear Expansion: | 13.3 |
| Enthalpy Of Fusion: | 16.8 |
| Enthalpy Of Vaporization: | 250 |
| Enthalpy Of Atmization: | 232 |
| Most Common Oxidation Numbers: | 3 |
| Color: | Silvery white |
| Classification: | Metallic |
| Discovered By: | Per Theodore Cleve |
| Discovered At: | Sweden |
| Discovered When: | 1879 |
| Origin Of Name: | Named after Thule, an ancient name for Scandinavia |
Calculate the molecular weight of Thulium or molecular weight Tm.
Also see the full list of chemical elements and atomic weights.